【正文】 nger Verlay,Berlin,1977 [36]. MOTOROLA COMS Inc,1998 [37]. Noise Reduction Techniques for MicrocontrollerBased Inc,2001 [38]. Remendations on International Hamonigation Training, Qualification, and Certification of Nondestructive Testing Personnel(1985),JnTernational Committee on Nondestructive testing,Zoetermeer,Netherlands. [39] ANSI/ASNT CP1891995.“American National Standard for Qualifieation and Certification of Nondestructive Testing Personnel”(1995),Appendix BTraining Outlines and References Publ:shed by ASNTJne. [40] Dimla D E,Lister JR P M,Leighton N solutions to the tool condit ioin monitoring problem in metal cuttingA critical review of J Mach Tools Manufact,1997,37(9):1219~1241 [41] and Testing of ,Springer Verlay,Berlin,1977 [42] Jack Blitg and Methods of Nondestructive amp。Hall,1996 [43] MOTOROLA COMS Inc,1998 [44] M68EML08GP32 HCMOS Microcontroller Unit Technical Inc,2001 [45] Noise Reduction Techniques for MicrocontrollerBased ,2001 [46] PGA202 User [47] Linear Databook Semicconductor Corporation,1997 [48] Rangwala S,Dornfeld D Integration Using Neural Networks forIntelligent Tool Condition of ASME,Journal of Engineering forIndustry,1990,112(8:219~228) [49] Byrne G,Dornfeld condition monitoring(TCM)The status of researchand industrial of the CIRP,1995,44(2):541~567 [50] Waschkies E,Sklarezyk C,Hepp Wear Monitoring at of ASME,Journal of Engineering for Industry,1994,116(9):521~524附 錄附錄一超聲波液位計(jì)電路原理圖超聲波液位計(jì)電路原理圖 附錄二超聲波液位儀PCB板圖超聲波液位儀PCB板圖附錄三程序清單中斷入口程序ORG 0000HLJMP STARTORG 0003HLJMP PINT0ORG 000BHretiORG 0013HRETIORG 001BHLJMP INTT1ORG 0023HRETIORG 002BHRETI主程序START: MOV SP,4FH MOV R0,40H 。40H43H為顯示數(shù)據(jù)存放單元（40H為最高位） MOV R7,0BHCLEARDISP：MOV @R0,00HINC R0 DJNZ R7,CLEARDISP MOV 20H,00H MOV TMOD,11H 。T1,T0 為16為定時(shí)器 MOV TH0,00H 。65毫秒初值 MOV TL0,00H MOV TH1,00H MOV TL1,00H MOV P0,0FFH MOV P1,0FFH MOV P2,0FFH MOV P3,0FFH MOV R4,04H 。超聲波脈沖個(gè)數(shù)控制（為賦值的一半） SETB PX0 SETB ET1 SETB EA SETB TR1 。開啟測(cè)距定時(shí)器 start1: LCALL DISPLAY JNB 00H,START1 。收到反射信號(hào)時(shí)標(biāo)志位為1 CLR EA LCALL WORK 。計(jì)算距離子程序 clr EA MOV R2,32h。64H 。測(cè)量間隔控制（約4*100=400MS） LOOP: LCALL DISPLAY DJNZ R2,LOOP CLR 00H setb et0 mov th0,00h mov tl0,00h SETB TR1 。從新開啟測(cè)距定時(shí)器 SETB EA SJMP Start1。 中斷程序T1中斷，發(fā)超聲波用 ， T1中斷，65毫秒中斷一次INTT1: CLR EA CLR TR0 clr ex0 MOV TH0,00HMOV TL0,00HMOV TH1,00HMOV TL1,00HSETB ET0SETB EASETB TR0 。啟動(dòng)計(jì)數(shù)器T0intt11:CPL VOUT 。40KHZnopnopnopnopnopnopnopnopnopDJNZ R4,intt11 。 超聲波發(fā)射完畢MOV R4,04Hlcall delay_250 。延時(shí)，避開超發(fā)射的直達(dá)聲波信號(hào)SETB EX0 。開啟接收收回波中斷 RETIOUT: RETI 。外中斷0，收到回波時(shí)進(jìn)入PINT0: nop jb ,pint0_exit CLR TR0 。關(guān)計(jì)數(shù)器 CLR EA 。 CLR EX0 。 MOV 44H,TL0 。將計(jì)數(shù)器值移入處理單元 MOV 45H,TH0 。 mov th0,00h mov tl0,00h jnb ,$ SETB 00H 。接收成功標(biāo)志 pint0_exit: RETI。 顯示程序40H為最高位，43H為最低位，先掃描高位DISPLAY: MOV R1,40H。GMOV R5,7fH。GPLAY: MOV A,R5MOV P0,0FFHMOV P2,AMOV A,@R1MOV DPTR,TABMOVC A,@A+DPTRMOV P0,ALCALL DL1MSINC R1MOV A,R5JNB ,ENDOUT。GRR AMOV R5,AAJMP PLAYENDOUT: MOV P2,0FFHMOV P0,0FFHRET。TAB: DB 18h, 7Bh, 2Ch, 29h, 4Bh, 89h, 88h, 3Bh, 08h, 09h,0ffh。共陽(yáng)段碼表 0 1 2 3 4 56 7 8 9 不亮A。延時(shí)程序 DL1MS: push 06h push 07h MOV R6,14H DL1: MOV R7,19H DL2: DJNZ R7,DL2 DJNZ R6,DL1 pop 07h pop 06h RET。 距離計(jì)算程序work: PUSH ACC PUSH PSW PUSH B MOV PSW, 18h MOV R3, 45H MOV R2, 44H MOV R1, 00D MOV R0, 17D LCALL MUL2BY2 MOV R3, 03H MOV R2, 0E8H LCALL DIV4BY2 LCALL DIV4BY2 MOV 40H, R4 MOV A,40H JNZ JJ0 MOV 40H,0AH 。最高位為零，不點(diǎn)亮 JJ0: MOV A, R0 MOV R4, A MOV A, R1 MOV R5, A MOV R3, 00D MOV R2, 100D LCALL DIV4BY2 MOV 41H, R4 MOV A,41H JNZ JJ1 MOV A,40H 。次高位為0，先看最高位是否為不亮 SUBB A,0AH JNZ JJ1 MOV 41H,0AH 。最高為不量，次高位也不亮 JJ1: MOV A, R0 MOV R4, A MOV A, R1 MOV R5, A MOV R3, 00D MOV R2, 10D LCALL DIV4BY2 MOV 42H, R4 MOV A,42H JNZ JJ2 MOV A,41H 。次次高位為0，先看次高位是否為不亮 SUBB A,0AH JNZ JJ2 MOV 42H,0AH 。次高位不亮，次次高位也不亮 JJ2: MOV 43H, R0 POP B POP PSW